Trade car in at dealership or get it fixed?

I’m trying to trade in my car to the same dealership where I got my current car, I’ve been having issues with my car ever since I got my car and drove it off the lot and within 4 days it had ac issues. I took it back in for repairs and it was fixed but a lil while kept going back to square one with issues with the ac and then eventually the heater in my car as well had issues. I tried to take my car to the dealership to fix it but the warranty on my car had issues too the people at the dealership told me they see I’m paying for a warranty but it doesn’t show in the system of the warranty anyways the guy who sold me this car screwed me over and now he doesn’t work there and I’m getting too annoyed with this ac/heater issues with my car so I’m tryna trade my car in but I can’t because I have a 569 credit and I’m not sure what to do by this point because I need a car for transportation because I’m in the army the no ac/heater issues anoying me but if I take it to get fixed I’ll have to pay when really the dealership should and I wouldn’t have transportation but I can’t trade my car in because I need to get approved for a loan which it’s hard with my credit score and I’m not sure what to do or how to go about this